Katz Jewelry Company was founded in New York City in 1963 by husband and wife team David and Rose Katz. Originally created as a way to sell jewelry to the couple’s friends, the company became a word-of-mouth success story as friends and customers recommended the small business for its personalized service, quality remodeling work and custom orders..Custom jewelry design and jewelry repairs in New York City, NY. We have been in the jewelry business for over 50 years as a family operation. We design engagement rings, work with heirloom jewelry, and also deal in lab grown diamonds. Please contact us if you need any help.